Can a slipping tranny be fixed by changing the fluid? 05 ford taurus has 135,000 miles and never changed the fluid.it is used to deliver the mail

It would be a band aid, It might help for a little bit but it sure won't fix the problem.

The clutch packs are likely shot. You can give it a try and see if it helps. This write-up may help:

https://www.askmehelpdesk.com/cars-t...tml#post552241

ATXs are the weak link in all FWD vehicles. Ford recommends dropping and cleaning the pan, replacing the filter, and chaning the fluid every 30,000 miles with Mercon V. I use Mobil 1 Synthetic Multi-Vehicle ATF, for an extra margin of safety, and still change it every 30,000 miles on my 2000 Taurus. The ATX should go the distance, following this procedure.

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Originally Posted by lilpoppa

It would be a band aid, It might help for a little bit but it sure won't fix the problem.

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Changing fluid my make it worse at this time of trans. Life, it would clean out the "pot holes" in the tooth flanks and increase the wear and act as a hydraulic pumping action on the worn flanks. And weaken the tooth profiles. Problem is in your clutch pumps..